/* 全局样式重置 */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  line-height: 1.6;
  color: #333;
  background-color: #fff;
  overflow-x: hidden;
}

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px;
}

/* 导航栏样式 */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid rgba(0, 0, 0, 0.1);
  z-index: 1000;
  transition: all 0.3s ease;
}

.navbar .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1rem 20px;
}

.nav-brand {
  display: flex;
  align-items: center;
  gap: 12px;
  font-weight: 600;
  font-size: 1.25rem;
  color: #333;
}

.logo {
  width: 32px;
  height: 32px;
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  font-weight: bold;
}

.nav-menu {
  display: flex;
  gap: 2rem;
}

.nav-link {
  text-decoration: none;
  color: #666;
  font-weight: 500;
  transition: color 0.3s ease;
  position: relative;
}

.nav-link:hover {
  color: #667eea;
}

.nav-link::after {
  content: '';
  position: absolute;
  bottom: -5px;
  left: 0;
  width: 0;
  height: 2px;
  background: #667eea;
  transition: width 0.3s ease;
}

.nav-link:hover::after {
  width: 100%;
}

.nav-actions {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.mobile-menu-toggle {
  display: none;
  flex-direction: column;
  gap: 4px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 8px;
}

.mobile-menu-toggle span {
  width: 24px;
  height: 2px;
  background: #333;
  transition: all 0.3s ease;
}

/* 按钮样式 */
.btn {
  display: inline-block;
  padding: 12px 24px;
  border: none;
  border-radius: 8px;
  font-size: 16px;
  font-weight: 500;
  text-decoration: none;
  cursor: pointer;
  transition: all 0.3s ease;
  text-align: center;
}

.btn-primary {
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  color: white;
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 25px rgba(102, 126, 234, 0.3);
}

.btn-secondary {
  background: transparent;
  color: #667eea;
  border: 2px solid #667eea;
}

.btn-secondary:hover {
  background: #667eea;
  color: white;
}

.btn-large {
  padding: 16px 32px;
  font-size: 18px;
}

/* 英雄区域样式 */
.hero {
  padding: 120px 0 80px;
  background: linear-gradient(135deg, #f5f7fa 0%, #c3cfe2 100%);
  min-height: 100vh;
  display: flex;
  align-items: center;
}

.hero .container {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 4rem;
  align-items: center;
}

.hero-title {
  font-size: 3.5rem;
  font-weight: 700;
  line-height: 1.2;
  margin-bottom: 1.5rem;
  color: #333;
}

.highlight {
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-description {
  font-size: 1.25rem;
  color: #666;
  margin-bottom: 2rem;
  line-height: 1.6;
}

.hero-actions {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
}

.hero-visual {
  display: flex;
  justify-content: center;
  align-items: center;
}

.app-screenshot {
  width: 100%;
  max-width: 500px;
  margin: 0 auto;
}

.screenshot-image {
  width: 100%;
  height: auto;
  border-radius: 16px;
  box-shadow: 0 20px 40px rgba(0, 0, 0, 0.15);
  transition: transform 0.3s ease;
  backdrop-filter: blur(10px);
}

.screenshot-image:hover {
  transform: translateY(-5px);
}

/* 通用区域样式 */
section {
  padding: 80px 0;
}

.section-header {
  text-align: center;
  margin-bottom: 4rem;
}

.section-header h2 {
  font-size: 2.5rem;
  font-weight: 700;
  margin-bottom: 1rem;
  color: #333;
}

.section-header p {
  font-size: 1.125rem;
  color: #666;
  max-width: 600px;
  margin: 0 auto;
}

/* 功能特性样式 */
.features {
  background: #f8fafc;
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 2rem;
}

.feature-card {
  background: white;
  padding: 2rem;
  border-radius: 16px;
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.08);
  transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.feature-card:hover {
  transform: translateY(-5px);
  box-shadow: 0 8px 30px rgba(0, 0, 0, 0.12);
}

.feature-icon {
  font-size: 3rem;
  margin-bottom: 1rem;
}

.feature-card h3 {
  font-size: 1.5rem;
  font-weight: 600;
  margin-bottom: 1rem;
  color: #333;
}

.feature-card p {
  color: #666;
  margin-bottom: 1.5rem;
  line-height: 1.6;
}

.feature-list {
  list-style: none;
}

.feature-list li {
  padding: 0.5rem 0;
  color: #555;
  position: relative;
  padding-left: 1.5rem;
}

.feature-list li::before {
  content: '✓';
  position: absolute;
  left: 0;
  color: #667eea;
  font-weight: bold;
}

/* 产品展示样式 */
.product-showcase {
  background: white;
}

.demo-tabs {
  display: flex;
  justify-content: center;
  gap: 1rem;
  margin-bottom: 3rem;
}

.tab-btn {
  padding: 12px 24px;
  border: 2px solid #e2e8f0;
  background: white;
  color: #666;
  border-radius: 8px;
  cursor: pointer;
  transition: all 0.3s ease;
  font-weight: 500;
}

.tab-btn.active,
.tab-btn:hover {
  border-color: #667eea;
  color: #667eea;
  background: rgba(102, 126, 234, 0.05);
}

.demo-content {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 3rem;
  align-items: center;
}

.screenshot-container {
  background: #f8fafc;
  border-radius: 12px;
  overflow: hidden;
  box-shadow: 0 8px 30px rgba(0, 0, 0, 0.1);
  position: relative;
}

.product-screenshot {
  width: 100%;
  height: auto;
  max-height: 400px;
  object-fit: contain;
  display: block;
  background: white;
}

.screenshot-overlay {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  background: rgba(0, 0, 0, 0.05);
  padding: 8px 16px;
  backdrop-filter: blur(10px);
}

.window-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.window-controls {
  display: flex;
  gap: 6px;
}

.control {
  width: 12px;
  height: 12px;
  border-radius: 50%;
  display: block;
}

.control.close {
  background: #ff5f57;
}

.control.minimize {
  background: #ffbd2e;
}

.control.maximize {
  background: #28ca42;
}

.window-title {
  font-size: 0.875rem;
  color: #666;
  font-weight: 500;
}

.window-header {
  background: #e2e8f0;
  padding: 12px 16px;
  display: flex;
  align-items: center;
  gap: 12px;
}

.window-controls {
  display: flex;
  gap: 6px;
}

.control {
  width: 12px;
  height: 12px;
  border-radius: 50%;
}

.control.close { background: #ff5f57; }
.control.minimize { background: #ffbd2e; }
.control.maximize { background: #28ca42; }

.window-title {
  font-size: 14px;
  color: #666;
  font-weight: 500;
}

.window-content {
  padding: 3rem;
  text-align: center;
  color: #666;
  font-size: 1.125rem;
}

.demo-info h3 {
  font-size: 1.75rem;
  font-weight: 600;
  margin-bottom: 1rem;
  color: #333;
}

.demo-info p {
  color: #666;
  margin-bottom: 2rem;
  line-height: 1.6;
}

.demo-features {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.demo-feature {
  display: flex;
  justify-content: space-between;
  padding: 12px 0;
  border-bottom: 1px solid #e2e8f0;
}

.feature-label {
  font-weight: 500;
  color: #333;
}

.feature-value {
  color: #667eea;
  font-weight: 500;
}

/* 下载区域样式 */
.download-section {
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  color: white;
}

.download-section .section-header h2,
.download-section .section-header p {
  color: white;
}

.download-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 2rem;
  margin-bottom: 4rem;
}

.download-card {
  background: rgba(255, 255, 255, 0.1);
  backdrop-filter: blur(10px);
  padding: 2rem;
  border-radius: 16px;
  text-align: center;
  border: 1px solid rgba(255, 255, 255, 0.2);
  transition: transform 0.3s ease;
}

.download-card:hover {
  transform: translateY(-5px);
}

.platform-icon {
  font-size: 3rem;
  margin-bottom: 1rem;
}

.download-card h3 {
  font-size: 1.5rem;
  font-weight: 600;
  margin-bottom: 0.5rem;
}

.download-card p {
  color: rgba(255, 255, 255, 0.8);
  margin-bottom: 1.5rem;
}

.download-info {
  display: flex;
  justify-content: space-between;
  margin-bottom: 1.5rem;
  font-size: 0.875rem;
  color: rgba(255, 255, 255, 0.8);
}

.download-card .btn {
  background: white;
  color: #667eea;
  width: 100%;
}

.download-card .btn:hover {
  background: rgba(255, 255, 255, 0.9);
}

.download-notes {
  background: rgba(255, 255, 255, 0.1);
  backdrop-filter: blur(10px);
  padding: 2rem;
  border-radius: 16px;
  border: 1px solid rgba(255, 255, 255, 0.2);
}

.download-notes h4 {
  font-size: 1.25rem;
  font-weight: 600;
  margin-bottom: 1.5rem;
  text-align: center;
}

.update-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 2rem;
}

.update-item h5 {
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: 1rem;
  color: rgba(255, 255, 255, 0.9);
}

.update-item ul {
  list-style: none;
}

.update-item li {
  padding: 0.25rem 0;
  color: rgba(255, 255, 255, 0.8);
  position: relative;
  padding-left: 1rem;
}

.update-item li::before {
  content: '•';
  position: absolute;
  left: 0;
  color: rgba(255, 255, 255, 0.6);
}

/* 快速开始样式 */
.quick-start {
  background: #f8fafc;
}

.steps-container {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1.5rem;
}

.step-item {
  background: white;
  padding: 2rem;
  border-radius: 16px;
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.08);
  position: relative;
  text-align: center;
  transition: transform 0.3s ease;
}

.step-item:hover {
  transform: translateY(-5px);
}

.step-number {
  position: absolute;
  top: -15px;
  left: 50%;
  transform: translateX(-50%);
  width: 30px;
  height: 30px;
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  color: white;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 600;
  font-size: 0.875rem;
}

.step-content {
  margin-bottom: 1.5rem;
}

.step-content h3 {
  font-size: 1.25rem;
  font-weight: 600;
  margin-bottom: 1rem;
  color: #333;
}

.step-content p {
  color: #666;
  line-height: 1.6;
}

.step-icon {
  font-size: 2.5rem;
  opacity: 0.7;
}

/* 页脚样式 */
.footer {
  background: #1a202c;
  color: white;
  padding: 3rem 0 1rem;
}

.footer-content {
  display: grid;
  grid-template-columns: 1fr 2fr;
  gap: 3rem;
  margin-bottom: 2rem;
}

.footer-brand {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.footer-logo {
  width: 40px;
  height: 40px;
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  border-radius: 8px;
}

.footer-brand p {
  color: #a0aec0;
  line-height: 1.6;
}

.footer-links {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  gap: 2rem;
}

.link-group h4 {
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: 1rem;
  color: white;
}

.link-group a {
  display: block;
  color: #a0aec0;
  text-decoration: none;
  padding: 0.25rem 0;
  transition: color 0.3s ease;
}

.link-group a:hover {
  color: #667eea;
}

.footer-bottom {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-top: 2rem;
  border-top: 1px solid #2d3748;
  color: #a0aec0;
}

.social-links {
  display: flex;
  gap: 1rem;
}

.social-links a {
  color: #a0aec0;
  text-decoration: none;
  transition: color 0.3s ease;
}

.social-links a:hover {
  color: #667eea;
}

/* 移动端导航菜单样式 */
@media (max-width: 768px) {
  .nav-menu {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: white;
    flex-direction: column;
    padding: 1rem;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.1);
    transform: translateY(-10px);
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s ease;
  }

  .nav-menu.active {
    transform: translateY(0);
    opacity: 1;
    visibility: visible;
  }

  .mobile-menu-toggle.active span:nth-child(1) {
    transform: rotate(45deg) translate(5px, 5px);
  }

  .mobile-menu-toggle.active span:nth-child(2) {
    opacity: 0;
  }

  .mobile-menu-toggle.active span:nth-child(3) {
    transform: rotate(-45deg) translate(7px, -6px);
  }
}

/* 功能亮点详细介绍样式 */
.highlights-section {
  padding: 80px 0;
  background: linear-gradient(135deg, #f8f9ff 0%, #e8f2ff 100%);
}

.highlights-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
  gap: 30px;
  margin-top: 50px;
}

.highlight-item {
  background: white;
  padding: 30px;
  border-radius: 16px;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
  transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.highlight-item:hover {
  transform: translateY(-5px);
  box-shadow: 0 20px 40px rgba(0, 0, 0, 0.15);
}

.highlight-icon {
  font-size: 3rem;
  margin-bottom: 20px;
}

.highlight-item h3 {
  font-size: 1.4rem;
  color: #2c3e50;
  margin-bottom: 15px;
  font-weight: 600;
}

.highlight-item p {
  color: #666;
  line-height: 1.6;
  margin-bottom: 20px;
}

.highlight-details {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  align-items: center;
}

.detail-tag {
  background: #667eea;
  color: white;
  padding: 4px 12px;
  border-radius: 20px;
  font-size: 0.85rem;
  font-weight: 500;
}

.detail-text {
  color: #888;
  font-size: 0.9rem;
  line-height: 1.4;
}

/* 使用场景展示样式 */
.scenarios-section {
  padding: 80px 0;
  background: white;
}

.scenarios-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 30px;
  margin-top: 50px;
}

.scenario-card {
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  color: white;
  padding: 30px;
  border-radius: 16px;
  text-align: center;
  transition: transform 0.3s ease;
}

.scenario-card:hover {
  transform: translateY(-5px);
}

.scenario-icon {
  font-size: 3rem;
  margin-bottom: 20px;
}

.scenario-card h3 {
  font-size: 1.4rem;
  margin-bottom: 15px;
  font-weight: 600;
}

.scenario-card p {
  line-height: 1.6;
  margin-bottom: 25px;
  opacity: 0.9;
}

.scenario-flow {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  align-items: center;
  gap: 10px;
  margin-top: 20px;
}

.flow-step {
  background: rgba(255, 255, 255, 0.2);
  padding: 8px 16px;
  border-radius: 20px;
  font-size: 0.85rem;
  font-weight: 500;
  backdrop-filter: blur(10px);
}

.flow-arrow {
  font-size: 1.2rem;
  opacity: 0.7;
}

/* 技术优势对比样式 */
.comparison-section {
  padding: 80px 0;
  background: linear-gradient(135deg, #2c3e50 0%, #34495e 100%);
  color: white;
}

.comparison-table {
  background: white;
  border-radius: 16px;
  overflow: hidden;
  box-shadow: 0 20px 40px rgba(0, 0, 0, 0.1);
  margin-top: 50px;
}

.comparison-header {
  display: grid;
  grid-template-columns: 2fr 2fr 2fr;
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  color: white;
  font-weight: 600;
  font-size: 1.1rem;
}

.comparison-header > div {
  padding: 20px;
  text-align: center;
}

.comparison-row {
  display: grid;
  grid-template-columns: 2fr 2fr 2fr;
  border-bottom: 1px solid #eee;
  transition: background-color 0.3s ease;
}

.comparison-row:hover {
  background-color: #f8f9fa;
}

.comparison-row > div {
  padding: 20px;
  display: flex;
  align-items: center;
  gap: 10px;
  color: #333;
}

.feature-col {
  background-color: #f8f9fa;
  font-weight: 600;
  color: #2c3e50 !important;
}

.traditional-col {
  text-align: center;
  justify-content: center;
}

.personal-assistant-col {
  text-align: center;
  justify-content: center;
  background-color: #f0fff4;
}

.status-good {
  color: #27ae60;
  font-size: 1.2rem;
}

.status-bad {
  color: #e74c3c;
  font-size: 1.2rem;
}

.status-neutral {
  color: #f39c12;
  font-size: 1.2rem;
}

.comparison-summary {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 30px;
  margin-top: 50px;
}

.summary-card {
  background: rgba(255, 255, 255, 0.1);
  padding: 30px;
  border-radius: 16px;
  backdrop-filter: blur(10px);
  border: 1px solid rgba(255, 255, 255, 0.2);
}

.summary-card h3 {
  font-size: 1.3rem;
  margin-bottom: 15px;
  color: #ecf0f1;
}

.summary-card p {
  line-height: 1.6;
  color: #bdc3c7;
}

/* FAQ 样式 */
.faq-section {
  padding: 80px 0;
  background: #f8f9fa;
}

.faq-container {
  max-width: 800px;
  margin: 50px auto 0;
}

.faq-item {
  background: white;
  border-radius: 12px;
  margin-bottom: 20px;
  box-shadow: 0 5px 15px rgba(0, 0, 0, 0.08);
  overflow: hidden;
  transition: box-shadow 0.3s ease;
}

.faq-item:hover {
  box-shadow: 0 10px 25px rgba(0, 0, 0, 0.12);
}

.faq-question {
  padding: 25px 30px;
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
  background: white;
  transition: background-color 0.3s ease;
}

.faq-question:hover {
  background-color: #f8f9fa;
}

.faq-question h3 {
  margin: 0;
  font-size: 1.2rem;
  color: #2c3e50;
  font-weight: 600;
}

.faq-toggle {
  font-size: 1.5rem;
  color: #667eea;
  font-weight: bold;
  transition: transform 0.3s ease;
}

.faq-item.active .faq-toggle {
  transform: rotate(45deg);
}

.faq-answer {
  padding: 0 30px;
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.3s ease, padding 0.3s ease;
}

.faq-item.active .faq-answer {
  padding: 0 30px 25px;
  max-height: 500px;
}

.faq-answer p {
  color: #666;
  line-height: 1.6;
  margin-bottom: 15px;
}

.faq-answer ul {
  list-style: none;
  padding: 0;
}

.faq-answer li {
  padding: 8px 0;
  color: #666;
  line-height: 1.5;
  position: relative;
  padding-left: 20px;
}

.faq-answer li:before {
  content: "•";
  color: #667eea;
  font-weight: bold;
  position: absolute;
  left: 0;
}

.faq-answer strong {
  color: #2c3e50;
}

/* 响应式设计 */
@media (max-width: 768px) {
  .container {
    padding: 0 16px;
  }

  .mobile-menu-toggle {
    display: flex;
  }

  .hero .container {
    grid-template-columns: 1fr;
    text-align: center;
  }

  .hero-title {
    font-size: 2.5rem;
  }

  .hero-actions {
    justify-content: center;
  }

  .app-screenshot {
    max-width: 400px;
  }

  .highlights-grid {
    grid-template-columns: 1fr;
    gap: 20px;
  }

  .highlight-item {
    padding: 20px;
  }

  .scenarios-grid {
    grid-template-columns: 1fr;
    gap: 20px;
  }

  .scenario-flow {
    flex-direction: column;
    gap: 8px;
  }

  .flow-arrow {
    transform: rotate(90deg);
  }

  .comparison-header,
  .comparison-row {
    grid-template-columns: 1fr;
  }

  .comparison-header > div,
  .comparison-row > div {
    padding: 15px;
    text-align: left;
  }

  .traditional-col,
  .personal-assistant-col {
    text-align: left;
    justify-content: flex-start;
  }

  .comparison-summary {
    grid-template-columns: 1fr;
    gap: 20px;
  }

  .features-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 1.5rem;
  }

  .demo-content {
    grid-template-columns: 1fr;
    text-align: center;
  }

  .download-grid {
    grid-template-columns: 1fr;
  }

  .steps-container {
    grid-template-columns: repeat(2, 1fr);
    gap: 1rem;
  }

  .footer-content {
    grid-template-columns: 1fr;
    text-align: center;
  }

  .footer-bottom {
    flex-direction: column;
    gap: 1rem;
    text-align: center;
  }

  .update-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 480px) {
  .hero-title {
    font-size: 2rem;
  }

  .btn-large {
    padding: 14px 24px;
    font-size: 16px;
  }

  .hero-actions {
    flex-direction: column;
    width: 100%;
  }

  .hero-actions .btn {
    width: 100%;
  }

  .section-header h2 {
    font-size: 2rem;
  }

  .feature-card,
  .download-card,
  .step-item {
    padding: 1.5rem;
  }
}



.step-number {
  position: absolute;
  top: -15px;
  left: 50%;
  transform: translateX(-50%);
  width: 30px;
  height: 30px;
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  color: white;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 600;
  font-size: 0.875rem;
}

.step-content {
  margin-bottom: 1.5rem;
}

.step-content h3 {
  font-size: 1.25rem;
  font-weight: 600;
  margin-bottom: 1rem;
  color: #333;
}

.step-content p {
  color: #666;
  line-height: 1.6;
}

.step-icon {
  font-size: 2.5rem;
  opacity: 0.7;
}

/* 页脚样式 */
.footer {
  background: #1a202c;
  color: white;
  padding: 3rem 0 1rem;
}

.footer-content {
  display: grid;
  grid-template-columns: 1fr 2fr;
  gap: 3rem;
  margin-bottom: 2rem;
}

.footer-brand {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.footer-logo {
  width: 40px;
  height: 40px;
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  border-radius: 8px;
}

.footer-brand p {
  color: #a0aec0;
  line-height: 1.6;
}

.footer-links {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  gap: 2rem;
}

.link-group h4 {
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: 1rem;
  color: white;
}

.link-group a {
  display: block;
  color: #a0aec0;
  text-decoration: none;
  padding: 0.25rem 0;
  transition: color 0.3s ease;
}

.link-group a:hover {
  color: #667eea;
}

.footer-bottom {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-top: 2rem;
  border-top: 1px solid #2d3748;
  color: #a0aec0;
}

.social-links {
  display: flex;
  gap: 1rem;
}

.social-links a {
  color: #a0aec0;
  text-decoration: none;
  transition: color 0.3s ease;
}

.social-links a:hover {
  color: #667eea;
}

/* 响应式设计 */
@media (max-width: 768px) {
  .container {
    padding: 0 16px;
  }

  .nav-menu {
    display: none;
  }

  .mobile-menu-toggle {
    display: flex;
  }

  .hero .container {
    grid-template-columns: 1fr;
    text-align: center;
  }

  .hero-title {
    font-size: 2.5rem;
  }

  .hero-actions {
    justify-content: center;
  }

  .app-screenshot {
    max-width: 350px;
  }

  .features-grid {
    grid-template-columns: 1fr;
    gap: 1rem;
  }

  .demo-content {
    grid-template-columns: 1fr;
    text-align: center;
  }

  .download-grid {
    grid-template-columns: 1fr;
  }

  .steps-container {
    grid-template-columns: 1fr;
  }

  .footer-content {
    grid-template-columns: 1fr;
    text-align: center;
  }

  .footer-bottom {
    flex-direction: column;
    gap: 1rem;
    text-align: center;
  }

  .update-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 480px) {
  .hero-title {
    font-size: 2rem;
  }

  .btn-large {
    padding: 14px 24px;
    font-size: 16px;
  }

  .hero-actions {
    flex-direction: column;
    width: 100%;
  }

  .hero-actions .btn {
    width: 100%;
  }

  .steps-container {
    grid-template-columns: 1fr;
    gap: 1rem;
  }

  .step-item {
    padding: 1.5rem;
  }
}
